How to make a gold detector

How to make a gold detector device industry from natural materials:

a sprig of Pomegranate tree and figs and olives level figure, tall and at least a meter, and usability are simple; take a twig and catch him with both hands and say he is good, and when vibrating shows that where you shake it contains gold, this device is very rudimentary as it only shows the depth of the site specified by.

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Brass rods: skewers of copper is placed their idols in the form of a handle, you can catch it by hand, and then put a small piece of gold on the left flipper to impart a negative charge, and when the clash demonstrates the existence of gold bars under the device, and when their disagreement is not an indication that the place contains gold, when you wrap the left flipper to a certain direction it indicates the presence of this mineral.